Resist-mordant



WILLIAM T. \YHITEI-IEAD, OF MAGOG, CANADA, ASSIGNOR OF ONE-HALF TO HENRY D. DUPEE, OF BOSTON, MASSACHUSETTS.

RESIST-MORDANT.

SPECIFICATION forming part of Letters Patent No. 499,687, dated June 13, 1893.

Application filed January 16, lSQS. Serial No. 458,580. (No specimens.)

To all whom it may concern.-

Be it known that LWILLIAM T.WHITEHEAD, a subject of the Queen of Great Britain, residing at Magog, Province of Quebec, Dominion of Canada, have invented an Improvement in Resist-Mordants for Plain-Dyed Fabrics, of which the following is a specification.

This invention has for its object the production of cloth having a pattern or figure thereon of a shade contrasting with the ground, the pattern or figure being either of the same color as the ground color or of a different color, and in accordance therewith my invention consists in printing the pattern or figure on the cloth in a resist-mordant containing a zinc compound as the essential or active element, and thereafter dyeing the cloth a plain color, substantially as will be described.

In the practice of my invention I take cotton, Wool or silk fabric prepared for printing in any usual or Well known way, and print thereon the desired pattern or figure in a resist-mordant to be hereinafter particularly described, .dry in the usual way, and steam if required. I then dye the cloth a plain color in a jig, dye-beck, padding machine, or in any of the well known ways, and then develop and finish in the usual manner. The cloth so treated will then present a plain colored ground with the pattern or figure displayed thereon in the same color but of a shade con trasting with the ground.

In the course of my experiments I have discovered that by using a resist-mordant containing a zinc compound as the essential or active element thereof and printing the pattern or figure in such a resist-mordant mixed with a proper thickener, and thereafter dyeing the fabric a plain colorand finishing, the zinc in the mixture will act to mordant a portion of the plain color on the parts of the fabric covered by the resist-mordant, at the same time resisting some of the color on such portions, and the result is the figured efiect in two different shades of the same color. The pattern or figure in this instance will be lighter than the ground work. If a deep, dark shade of color is desired in the pattern, then that particular color will be mixed with the resist-mordant preparatory to printing therewith, and when the cloth has been plain dyed the same color and finished, the pattern or figure appears in a shade darker than the ground. In this instance the zinc appears to act as a mordant for the color carried by the mixture, fixing it in the cloth in the desired pattern, While it also acts to resist a portion of the plain color in the subsequent dyeing.

I prepare the resist-mordant mixture by taking about six pounds of a zinc compound as the oxide, hydrate or carbonate of zinc and mix it with one-half a gallon of water, to which I add one gallon of starch paste, (one and one-half pounds per gallon) and one-half gallon of albumen solution, (six pounds per gallon) or any other usual thickening preparation such as gum tragacanth or gum arabic. These ingredients are'thoroughly mixed and the cloth is printed therewith.

For general use I prefer the oxide of zinc, but I do not desire to restrict myself thereto, nor to the hydrate or carbonate of zinc, nor to the exact stated quantity of zinc compound, as any zinc compound will give good results inasmuch as the zinc is the essential or active element of the resist-mordant the zinc being supplied by the compound.

If the pattern or figure is to be of a darker 8o shade than the ground, I mix a coal tar ex tract or pigment color with the foregoing mixture in the proper proportion and quantity, the same varying according to the depth of shade desired,'the character of the pattern, particular nature of the color itself, &c.

I can also produce very beautiful effects by my process by making the color in the resistmordant and the color of the ground different, in which case the finished cloth will have 0 the pattern or figure in one color and the ground in another, and pattern and ground may or may not contrast in shade as desired.

I do not wish to restrict myself to the exact proportions of the mixture described, as the same can be varied without departing from the scope of my invention, the gist of which consists in producing a pattern or figure by the employment of a resist-mordant containing zinc as its essential or active element.

I claim 1. The process of producing cloth havinga IOO pattern or figure thereonof a shade contrasting with the ground, which consists in printing the pattern or figure on the cloth in a resist-mordant containing a zinc compound as the'vessential or active element, and thereafter dyeing the cloth a plain color, substantially as described.

2. The process of producing cloth having a pattern or figure thereon of a shade darker than the ground color, which consistsin printing the pattern or figure on the cloth in a resist-mordant containing a zinc compound as the essential or active element, and a color, and thereafter plain dyeing the cloth in the same color, substantially as described. 

